JCLOUDS-40 clear remaining references to Async.

Just a cleanup run.
Sadly, all methods don't currently contain Named. This is one of the
reasons I suggest we use error-prone to help us be able to remove
statements like this more authoritatively. For example, we could make an
error-prone bug pattern for forgetting to add the Named annotation which
will make the build fail.

https://code.google.com/p/error-prone/wiki/BugPatterns